Improvement in draw-bridge gates



J'. SCHWENNESEN.

-DRAW-43H1mus GATE. v `No.174,307. Patented Feb. 29,1875.

UNITED STATES PATENT OEEICE.

AJACOB SCHWENNESEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF .HIS RIGHT TO JOHANN SUHR, OF SAME PLACE.

IMPROVEMENT IN DRAW-BRIDGE GATES.

Specification forming part of Letters Patent No. l 74,307, dated February 29, 1876; application filed January 25, 1376.

`To all whom it may concern quently occur where anopen draw is left un protected. The invention consists in one or more gates at each side of the roadway, arranged to close automatically, when the draw is open, by a simple combination of a weight and cord, acting upon the gate through an arm below the door of the approach, and an eccen'trically-pivoted roller on the arm, acted vupon vby the end of the draw-spanto open the gate, as more fully hereinafter set forth.

Figure 1 is a perspective view, showing tho gates at one side of the roadway closed and at the other side open. Fig. 2 is an enlarged perspective view of a pair of gates closed, withportions of the approach and the draw. span broken away jto show the operatingparts. Fig. 3 is a plan vof an arm and its roller.

In the drawing, A represents an approach to a bridge, of which B represents a part of' the draw-span. y C is a gate-post erected at the head ofthe approach, at each side of the roadway, and at each side thereof is hung a gate, I) or Df, the'former to close the footway, and the latter to close one-half of the roadway. The pivot a of the gate is in each case stepped below the floor of the approach, where it has keyed on it anv arm, E, to the end of which issuspended a weight, F, by a cord, b, running over a pulley, c, to close the gate against a stop, d, when free to do so.

Eccentrically pivoted to and under each arm is a roller, G, which, when the gate isl closed, projects into the` path of the dra'w span. When the latter is swung in front of the approach a stringer,e,under its end, coming into contact with the rollers, successively pushes them 'and their arms back under the approach, and thus causes the gates to -be swung open. v

What I claim as my inventiomis- The combination of the arms E, cords b, weights F, and rollers G with gates D D', erected at the approach of a draw-bridge, and adapted to open and close the same by the action of the draw-span, substantially as described.

JACOB SCHWENNESEN. Witnesses:

WM. H. LoTz,

WM. HOFFMANN. 

